Mobile banking was available at 78% of all banks and credit unions in 2014 and an additional 16% said they planned to launch it in a year or two, according to a survey by the Federal Reserve District banks of Atlanta, Boston, Dallas, Richmond and Minneapolis. But just 4% of financial institutions report that more than half of their customers use it, and 80% said fewer than one in five customers is an active mobile banking user. Security concerns and customer awareness are probably the reasons, the study concluded. A separate study conducted for the American Bankers Association found more customers are using mobile deposit, they are doing so less frequently. One in seven Americans deposited a check using their smartphones in the past year, up from one in eight last year, but 54% did so once a month or more, down from 80 percent in 2014.